Mower Drive Torque Balancing for Independent Wheel Motors
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Solution Overview
Problem
Balancing the operation of separate motors in a velocity-controlled drive system of commercial mowers is challenging, leading to potential overheating and shutdowns due to unaccounted-for factors affecting torque distribution.
Innovation Solution
Implementing a torque balancing scheme using a controller to measure, combine, and compare torque data from multiple motors, calculate velocity correction factors, and adjust motor velocities to balance torque across the drive system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate motors are used to independently drive each wheel in velocity mode, then each wheel can be controlled independently for steering and positioning, but the motors may experience unbalanced torque distribution leading to overheating and shutdown
Solution Approach 1:
The controller continuously monitors torque measurements from all motors and uses this feedback to dynamically adjust velocity commands. By comparing actual torque output with expected values, the system detects imbalances and compensates by modifying velocity assignments to individual motors, preventing any single motor from being overloaded and overheating.
Solution Approach 2:
The system transitions from static velocity control to dynamic velocity control where velocity commands are continuously adjusted based on real-time torque conditions. The velocity correction factors are dynamically calculated and applied to balance torque distribution across motors during operation, allowing the system to adapt to changing load conditions and prevent overheating.
2Speed
If velocity mode is used for motor control, then precise velocity control is achieved, but torque imbalances caused by external factors (such as underinflated tires) cannot be compensated
Solution Approach 1:
The controller implements a feedback mechanism that monitors torque measurements from all motors and uses this information to calculate velocity correction factors. This feedback loop allows the system to detect torque imbalances caused by external factors such as underinflated tires and compensate by adjusting velocity commands, thereby maintaining both velocity precision and torque balance adaptability.
Solution Approach 2:
The system changes the velocity parameter dynamically based on torque conditions. By calculating velocity correction factors and applying them to individual motor velocity commands, the system adjusts operational parameters in real-time to compensate for external factors affecting torque distribution, while maintaining overall velocity control precision.
3Reliability
If torque balancing adjustments are made to prevent overheating, then motor reliability improves, but the complexity of the control system increases
Solution Approach 1:
The controller uses a feedback mechanism that leverages existing torque measurements from motors already being used for velocity control. By reusing this data and applying straightforward correction calculations, the system achieves torque balancing without requiring additional sensors or complex control algorithms, thus limiting the increase in system complexity.
Solution Approach 2:
The control system performs multiple functions using the same computational resources: it maintains velocity control, monitors torque for feedback, calculates velocity correction factors, and applies torque balancing adjustments. This multi-functionality allows the system to achieve torque balancing without requiring separate dedicated hardware or complex additional control systems.
Data Source
AI summary
A torque balancing scheme for a velocity controlled drive system of a mower is provided. The torque balancing scheme can be employed on any mower or other similar vehicle having a drive system in which a separate motor is used to independently drive each wheel. By implementing the torque balancing scheme, a drive system can prevent excessive heating of the motors that may otherwise occur when unaccounted-for factors exist.